The small, white shell has a flatly conical shape, with a glassy minute nucleus of one whorl and seven subsequent whorls.
en.wikipedia.org Solids that are neither crystalline nor polycrystalline, such as glass, are called "amorphous solids", also called glassy, vitreous, or noncrystalline.
en.wikipedia.org In most of the lunar regolith, half of the particles are made of mineral fragments fused by the glassy particles; these objects are called agglutinates.
en.wikipedia.org These pavements can be particularly treacherous when they are wet, presenting a glassy, low grip surface that can contribute to slips and falls.
en.wikipedia.org Less common are sheet flows, which are glassy and marginal, and indicative of larger-scale flows.
en.wikipedia.org